Access information and materials related to market participants’ requested billing adjustments (RBAs) to dispute amounts billed by ISO New England or to request meter data error (MDE) corrections.
Materials below include:
Information is updated on a regular basis as new RBAs are added or the status of existing RBAs changes.
The ISO Tariff provides for a market participant’s right to dispute amounts billed by ISO New England, as well as to request corrections for meter data errors. In all cases, the invoice amount must be paid in full before requesting a billing adjustment.
As such, there are two types of billing disputes in the ISO New England markets: requested billing adjustments (RBA) and meter data error requested billing adjustments (MDE RBA).
Under the ISO-NE billing policy, a participant may request an RBA to address any disputed amount resulting from the determination of a market clearing price or Transmission, Markets and Services Tariff rate by the ISO that allegedly either violates or is otherwise inconsistent with the Transmission, Markets and Services Tariff, or results from an error by the ISO.
The MDE RBA process may be used when an asset owner, host participant, or assigned meter reader identifies inaccuracies in metering data that cannot be resolved through the data reconciliation process (DRP). The ISO issues Market Information Server (MIS) reports (SP_METERDOMAIN, SP_METERPROFILED, SP_METERDIRECT) to asset owners and meter readers at regular intervals, and on request, to facilitate the resolution of metering discrepancies and limit the number of MDE RBAs. Participants may find the report schedule on the Metering and Resettlement Deadlines webpage and may request additional reports through Participant Support Services.
Download the meter data errors RBA submittal form. The MDE RBA process is detailed in Section 6.2 of Market Rule 1 Accounting (Manual M-28).
The ISO has settled only two RBAs in the last 10 years, while there has been an exponential increase in MDE RBAs in 2023 and 2024.
| Year | RBA | MDE RBA |
| 2022 | 0 | 8 |
| 2023 | 1 | 31 |
| 2024 | 0 | 117 |
Billing disputes and the subsequent settlement create an additional burden on participants. In the case of the MDE RBAs, the ISO issues the final settlement 11 months after the operating month. A final settlement may increase financial assurance requirements, delay payments, and require additional data processing. One way to prevent billing disputes is through diligent reconciliation and timely review of data.
